Wall ends are objects associated to a single wall.
They will not automatically trim with other walls/elements.
So you will need to perform Solid Element Operations or other editing techniques to trim side walls, roofs, etc.
Also you seem to have a problem with your surface texture hatch - seems to be rotated 90° to the 3D surface texture image.
One of the forum moderators. Versions 6.5 to 25 Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10 Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10